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"Your conditioned air inside and in your system the less tonage you will need..."

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Aproximately 1800 to 2000 square feet. Although alot depends on many factors: how much insulation do you have in the attic? Do you have double pane insulated windows? Are all your windows and doors sealed well? Is your exisisting duct work insulated and sealed well. do you have insulation under you floors? Is your attic vented well? I`m sure you get the picture. The more you can do to keep your conditioned air inside and in your system the less tonage you will need. The seer rating is just a scale by which a unit is rated on efficiency. A 13 seer unit will cost you more to opperate than a 19 seer unit. Square footage dose`nt really matter.
If you have all the above mentioned items covered you could possibly drop down to a 2 and a half ton unit for 1800 to200 sq feet. If you have a drafty old house and probably no insulation in the walls and very little in the ceiling then you could possibly require a 3 and a half ton unit. Good Luck, Rocky.

If you want to do a quick calculation you can use the square feet method which says a 1 ton central AC unit can cool roughly 500 sq ft of floor space. In your case a 2600 sq ft house would need at least a 5 ton central AC unit to keep it cool. You may be able to get a slightly smaller unit if you get one of the more energy efficient units with a higher SEER rating. Be advised, this is a fast calculation that makes a lot of assumptions that don`t make sense in the real world. To get the most accurate quote you need to use the Manual J method, which utilizes a manual published by ACCA.

"Do yoy need to replace the lineset on a new air conditoner..."

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DO Yoy need to Replace the lineset on a new air conditoner. It is best to replace when possible, It will make the new unit last longer. The polyolester oil in the new R410A systems will clean the old lines on the inside and can plugup the expansion device or filter dryer. Also the pressures are a lot higher on the R410A. You do not want to have any leaks in these new systems, they are more costly to repair, a major leak not repaired within minutes can result in needing to replace the equipment, where a R22 system could just be repaired and evacuated.

ruf-n-redy said: if the cu lines are in good condition, no they can be reused when going from r22 eqipment to r410a equipment, BUT they must be flushed properly, i prefer PAR FLUSH by PARKER. keep open lines sealed untill readdy to connect and weld. r410a uses POE oil, it is synthetic and has a hygronic characteristic, meaning it likes to obsorb water, moister. upon reconnecting lineset, you must evacuate systen to a minimum of 500 microns. this will remove any moister in lineset and new evaporator coil, the condensing unit shut off valves should remain in the closed position until above step has been completed and checked. system should remain at 500 microns for 5 minutes , if this is done properly , you can be assured you have a good tight system , so charge system , ck nameplate for recommended SUB-COOLING and you should be confident of a good long service life. one other comment 16SEER is only refering to its efficency rating with a matched system that will have a AHRA certification number. the main thing is making sure your existing lineset is in good physical condition and insulated, we use 1" wall thickness today and the lines are thoroughly flush and blown out with dry nitrogen, do not forget to seal ends until ready to fit and weld. best practice is to purge lines with dry nitrogen during welding lineset to cond and coli, this will keep cu oxide from forming on the insie og cu tubing

"For and older drafty..."

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For and older drafty, inefficient house 400SF per ton. Any sizing larger than this should be explained by the contractor.
- For a newer reasonably built house 600SF per ton.
- For an Energy Star Qualified house 600-800SF per ton.
- Well designed, thoughtfully crafted houses can achieve 800-1000 SF per ton.

"Lennox
i select goodman air condition brand because of value for dollar & warranty protection..."

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There are a lot of good air condition brands here just like York, Trane, Goodman Amana, Carrier [ICP family], Nordyne and all their `brand names`, Lennox
I select Goodman air condition brand because of value for dollar & warranty protection. Not all `brands` are available in all parts of the country.

"The average price for a 13 seer fedders..."

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The Average price for a 13 SEER Fedders central air conditioning system when purchased from a contractor: $5,543.00, but if you try to buy it through the internet then the 13 SEER Fedders central air conditioning system will cost you from 2000$ to 2500$
http://www.acdirect.com/xcart/product.php?productid=2568.

"You got some really good air conditioning..."

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You got some really good air conditioning! No seriously most likely if you condensor fan and your evaporater fan/blower both work then your most like low on refrigerant and that would mean a leak in the system.

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